We will ship from real US warehouses, 1-2 days delivery time,fast and efficient shopping experience, as well as brand quality assurance for you. Description: Brand:KRSEC Material: stainless steel Specification: 6.5/8.5mm(for single/double speed); Weight: 5.4g/pc,approx; Compatible single / double speed chainring Features: 1.colorful bolts: stainless steel, titanium plating , more rust-proof durable, cool fashion 2.Easy to install,which is convenient to use. 3.Commonly used on mountain bikes for two-piece disc locking. 4.Lightweight, tough and durable, it can be used for a long time.