1. Multi-PurposeThis pneumatic chamfering machine has a wide range of applications and can chamfer RC angles, round holes, irregular edges, arcs and straight edges on a wide variety of materials such as steel, aluminium, copper, acrylic and wood.14 inch metal filter, free speed: 30,000 rpm, air consumption 0.4min 2. Speed AdjustableMini deburring trimming chamfering tool features air grinder 1-5 block valve adjustment thickened knob, can adjust the gear speed freely. Chamfering size can be adjusted at will. Safety switch is used to prevent accidental touching and ensure safe use 3. Lightweight and HandheldThis 45 degree pneumatic mini chamfering machine air tool is lightweight, small and delicate, easy to operate with one hand. You can easily adjust the chamfering size and change the blade by using the matching spanner 4. C&R Angle BladesC angle blades are angled and are mainly used for metal chamfering, R angle blades are rounded and chamfered and are used in woodworking