magnet, easy to install The bristles are detachable, easy to install and easy to adjust the knife Name: CNC spindle brush. The brush material: 3D printing Screw model: x 8 Dust suction port diameter: 37mm Spindle brushes: 80mm diameter: supports 2.2kw spindle Color: Black Material: metal + plastic Package Contents: 1 x CNC spindle brush 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.