High Performance: Upgraded bevel grinder with high-quality bearings and blades for smoother deburring and chamfering. Tungsten steel triangular cutter heads, R-angle/C-angle chamfer, auxiliary bearing, strong and durable, smooth chamfering, no ripples, no noise, compact body, strong power, stable operation. Flexible and Adjustable: The speed can reach 30,000 rpm, air intake connection: 6.35 mm, and the depth is 0.1 mm to 0.9 mm. The five speeds can be freely adjusted to the appropriate air inlet speed, which improves the blade life and is easy to use and operate. Easy to Use: This mini 45-degree chamfering machine has a new lightweight design, small and exquisite, smooth cutting, high efficiency, low vibration, smooth cutting. Easy to operate with one hand. Difference between C and R angle: The C angle blade is angular, mainly used for metal chamfering, and the R angle blade is rounded and chamfered for woodworking. Wide application: This pneumatic chamfering machine can chamfer R/C angles, round holes, irregular edges, arcs, and straight edges on a variety of materials, including steel, aluminum, copper, acrylic, and wood.