Its inner hole is very tight and sealed to put the drill bit, hard to fall off. Prevent dust from flying when drilling, which is for your health, room hygiene. A utility tool and for protective drill. Prevent dust from falling into your eyes, clothes or the floor. The dust cover is lightweight and has a large capacity and does not increase the hand weight of the electric drill. It can work longer and is a practical accessory for electric drills. Easy to install, easy to clean. Suitable for home and professional use. Color: White Material: Rubber Size: 15 x 9.5 cm Package Contents: 2 x Dust Collecting Cup Only the above package content, other products are not included. Note: Light shooting 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 +/- 1-3 cm.