Meet the Mason 300 U-Lock - Heavy Duty Max Security Sold Secure Diamond U-Lock An Extreme Heavy Duty & Solid Professional Bike Lock, Seatylock’s Mason 300 U-Lock is an Exceptionally Strong Lock Rated with the Highest Level of Security: 20/20 Sold Secure Diamond. Get to Know Your Tough Maximum Security U-Lock with Zero Compromise on Design, Usability & Innovation! Seatylock Mason 300 U-Lock - Exceptionally Tough & Super Secure The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. The Seatylock Mason 300 U-Lock is The Toughest of Its Class Without Compromising on Usability! Our Innovative Design Includes Patented Pentagonal Hardened Steel Crossbars & Double Deadbolt Locking Mechanism for Protection Against Twist Attacks. Maximum Security Unparalleled by Our Competitors! Unique Patented Pentagonal Crossbars for Heavy Duty Protection The Seatylock Mason 300 U-Lock’s Unique Pentagonal Shaped Crossbars are Stronger Than Equivalent Sized Round, Square, or Hexagonal Crossbars. This Innovative Shape Gives You Superior, Best Class Protection While Keeping Your U-Lock Easy to Carry. The Widest of Its Kind for More Locking Options! Mason 300 U-Lock - Heavy Duty & Easy to Use Theft Deterrent from Seatylock The Mason 300 U-Lock’s Protective Silicone Casing Uses Soft Quality Polymer to Protect Your Bike Frame. It Also Adds Durability by Shielding the Lock From the Elements & Ensuring It Will Last Longer. Compact & Easy to Carry Bike Accessory from a Trusted Name in the Highest Level of Bike Security! Seatylock Mason 300 U-Lock’s Unique Automatic Keyhole Shutter Seatylock’s Mason U-Lock is Protected From All Possible Weather Damage. A Cutting Edge, Innovative Automatic Keyhole Shutter Locks Out Water, Dirt, Dust & Everything in Between to Preserve the Lifespan and Reliability of Your Highly Secure Bike Lock. Usability, Style & Highest Security Standards! Main Benefits of Our Seatylock Mason 300 U-Lock ✔ Highest DIAMOND Sold Secure U-Lock - The Mason 300 is a Portable Heavy Duty Professional ULock. It Provides the Highest Security Level Available, Exhibiting Sold Secure Diamond with 20 Security Scale. The Diamond Scale is Designated to Label Exceptionally Tough Locks - The Toughest in the Industry. ✔ Patented Heavy Duty Pentagonal Crossbars - Tough & Durable Waterproof Weatherproof Bicycle Protector with Unique Antitheft Pentagonal Crossbars. Well Tested Guard System Stops Thieves ✔ Extra Wide Clearance Between Bars - Unique Diamond Sold Secure U-Lock with Solid Portable Extra Wide Bars, Designed for Bikes, e-Bikes or Motorcycles... ✔ Rigorously Tested to Defeat Theft Attempts - We Tested the Mason U Lock by Using a Wide Variety of Stress Tests, Simulating Real-Life Attack Strategies by Thieves, Including Hacksaws, Bolt Cutters, Crowbars and Freeze Attacks. ✔ Only U-Lock with Double Thickness Protective Plates - Smart Cutting Edge Design for Extreme Protection. Ultimate Combination of Weight & Maximum Security for Safe Cycles. ✔ Reliable, Durable, and Super Easy to Use - Pro Break Resistant Theft Deterrent from Seatylock. It is an Easy Carry Bike Accessory. Anti Cut Rust Proof Coating & Components for Dependable & Quality Safety. ✔ Unique Automatic Keyhole Shutter - Protects Your Lock From Any & All Possible Weather Damage. Locks Out Water, Dirt, Dust & Everything in Between to Preserve the Lifespan and Reliability of Your Highly Secure Bike Lock. ✔ Automotive Standard Keys - Our Super Secure Bike Keys are as Safe as Car Keys! Forget Flimsy Bike Keys – Seatylock’s Keys Meet Automotive Industry Standards for Security. ------------------------------------------- Please Note: The Mounting Bracket Is Sold Separately. Compare Our Various U-Locks Mason 300 Diamond Add to Cart Mason 220 Diamond Add to Cart Mason 180 Diamond Add to Cart Mason 140 Diamond Add to Cart Customer Reviews 4.6 out of 5 stars 33 4.6 out of 5 stars 673 4.6 out of 5 stars 673 4.6 out of 5 stars 673 Price $84.98$84.98 $79.98$79.98 $74.98$74.98 $69.98$69.98 Security Level: 20/20 20/20 19/20 19/20 ART Certification: 3 Stars 3 Stars 3 Stars 3 Stars Sold Secure Certification: Diamond Diamond Diamond Diamond Weight: 1.7 Kg/3.75 lb 1.53 Kg/3.37 lb 1.07 Kg/2.35 lb 0.97 Kg/2.13 lb Internal Clearance Height: 300mm/11.8 Inch 220mm/8.66 Inch 180mm/7.1 Inch 140mm/5.5 Inch Internal Clearance Width: 11.5 cm/4.53 inch 11.5 cm/4.53 inch 8.5 cm/3.35 inch 8.5 cm/3.35 inch Unique Feature: Heavy Duty Max Security U-Lock Heavy Duty Max Security U-Lock Lightest Diamond Level U-Lock Lightest Diamond Level U-Lock 3-Year Peace of Mind: ✔ ✔ ✔ ✔ Registered Patent: Patented Pentagonal Crossbars Patented Pentagonal Crossbars Patented Triangular Crossbars Patented Triangular Crossbars Tested Against Theft Attempts: ✔ ✔ ✔ ✔ Especially Good For: e-Bikes & Large City Bikes e-Bikes & Motorcycles e-Scooters & City Bikes Fixie & Single Speed Bikes