Item Type: Window Pulley_x000D_ Material: Stainless Steel + Nylon_x000D_ Weight: Approx. 96g / 3.4oz_x000D_ Applicable Grooves Width: Approx. 14mm / 0.6in_x000D_ Scope of Application: Window, etc. 1Double wheels pulley design, with low friction, stable operation, silent and low noise, easy to push and pull. 2It is fixed with stainless steel rivets, which is firm and non corrosive, and has strong bearing capacity. 3Selected high quality stainless steel shell, copper double grooves and nylon wheels, durable, long lasting, wear resistant. 4Easy to install and assemble, stable structure, not easy to loosen, suitable for window with a slot width of 14mm. 5Practical window hardware accessories, exquisite workmanship, high strength and corrosion resistance. 4 x Window Pulley 8 x Screw