Our mechanism is shipped with a strap, hour and minute hands, seconds and a screw nut set. Although the mechanism fits all battery-operated watches, the responsibility for replacing it is entirely yours! The product is a silent clock mechanism - it works silently. Hour hand: 13 cm (The length from the hole center to the tip is 10 cm) Minute hand: 18 cm (The length from the hole center to the tip is 15 cm) Second hand: 16-5 cm (The length from the hole center to the tip is 12 cm) Shaft Motor is 14 mm . It can be hung on the wall from behind. It is compatible with 3D clock mechanisms. You can get support with a visual video for assembly. You can also review the installation instructions sent with the product.