ROCKBROS Motorcycle Bicycle U-Lock Anti-Theft Thickened MTB Bike Lock Alloy Steel 3 Keys RockBros Sale! No reviews from $59.99 Color Grey Black Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Brand: ROCKBROS Product name: Thickened Anti-Shear U-lock Material: high-strength aluminum alloy + zinc alloy lock cylinder + silicone jacket Item No: RKS626-BK color: black Key: 3pcs Steel diameter: about 4.5CM Lock body diameter: about 8CM Weight: 805g Application: bicycles, motorcycles, etc. SKU:RKS626-GR