Features 1、【Portable /u0026 Foldable Projector Screen】: 60/72/84/100/120/150 inch screen size for option. 16:9 screen format, a great partner for projector. Foldable and lightweight, easy to carry. 2、【Multiple Occasions】: Suitable for indoor and outdoors use. It can be widely used in home theater movie, business meeting, exhibitions, large business events, classroom training and more. Sharing your joyful time with your family or friends. 3、【Support 4K HD Image Quality】: High-definition picture is not blurred, high-definition vision is retained, and the light is soft and does not hurt the eyes. 4、【Top Quality Milk Silk Fabric】: The milk silk is made of 92% polyester + 8% spandex. The milk silk screen is delicate and smooth, elastic and has good recovery ability, so it is durable. 5、【Quick and Easy Installation】: Projector screen with black reinforced edges and metal holes, screen can be fastened easily with hooks, nails, ropes, adhesive tape on a wall. Comes with hooks for easy hanging. Specification Features: Suitable for 1/8 RC cars motor with 5mm shaft. Each motor pinion gear is equipped with a set screw. Durable metal construction for long-lasting performance. Professional processing technology on the surface, it is rust-proof. Fixed screw holes for easy and convenient to install. Specification: Material: Metal Color: Black Options: 17T-19T (17T, 18T, 19T), 20T-22T (20T, 21T, 22T) Height: 14mm / 0.55inch Tip Diameter: 17T: 19mm / 0.75inch 18T: 20mm / 0.79inch 19T: 21mm / 0.83inch 20T: 22mm / 0.87inch 21T: 23mm / 0.91inch 22T: 24mm / 0.94inch Suitable Shaft Diameter: 5mm / 0.20inch Weight: 49 - 56g Type: RC Part Package Includes: 1 x M1 17T Motor Gear 1 x M1 18T Motor Gear 1 x M1 19T Motor Gear or 1 x M1 20T Motor Gear 1 x M1 21T Motor Gear 1 x M1 22T Motor Gear Package List