Installation Type: M8x15mm Threaded Stem; Package Contents: 4 x Screw-on Casters (50mm Diameter), 1 x Simple Wrench. *Please confirm the screw size before purchasing, as the screw size is metric M8 standard thread (maximum diameter of the screw is 8 mm). Material: Iron (zinc-plated), Nylon, each wheel can bear a weight of 45 kg. For wheel repair of shopping carts, suitcases, carry boxes, etc., caster replacement. Easily replace worn casters yourself! *Instant purchase welcome, midnight silent purchase OK ◎ *One-of-a-kind, first-come, first-served *Bulk purchase welcome, feel free to comment *Free shipping! ・Please understand and purchase with home storage and simple packaging. (⁎ᵕᴗᵕ⁎) ・Please check the actual photos for the condition of the product♪ *In order to sell at a slightly lower price, we may ship the product out of its box due to shipping costs. BESTU Screw-on Casters, Threaded Casters, Swivel with Stopper, 50mm Swivel, M8 8mm A-type screw, Wagon, Shopping Cart, Furniture, Replacement Tire Kit, DIY, Twin Wheel, Hard Rubber Caster, 50 Diameter, Set of 4 #Kana's product list is here ✨️☜ ☆47-27☆