Model Number: RS550 Voltage: 21V No load Speed: 400 - 19500 rpm Torque: 1 N.m Output Power: 90W Type: Micro Motor Usage: Home Appliance Construction: Permanent Magnet Commutation: Brush Protect Feature: Explosion proof Motor Length: 75.1mm Motor Diameter: 37.2mm Motor Shaft Length: 12mm Motor Shaft Diameter: 3.2mm Motor Gear Diameter: 8.6mm Motor Gear Thickness: 5.2mm Motor Installation Hole Distance: 25mm Place of Application: Electric Drill / Screwdriver Product Weight : 228 G / 8.04 Ounces Product Dimensions (L*W*H) : 70*36*36 MM / 2.76*1.42*1.42 Inches Package Include: 1 x 21V Two-speed 12 Teeth DC Motor