Diverse options: One silent clock mechanism, three pairs of hour/minute hands, and a second hand - multiple combinations to choose from! Accessory parameters:One iron hook, one rubber washer, one metal washer, one nut, battery not included. Highly versatile: Short-shaft clock mechanisms are ideal for clock with a thickness of 1-3mm, making them the perfect choice for thinner clocks. Warm notice: Install hands in order (hour, minute, second) and keep them parallel for smooth operation. Avoid excessive force to prevent bending. Colour:Black Material:Plastic + Metal size:Shaft length 16mm+23mm Package Contents: 1 * Clock Repair Parts7 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.