Die Grinder Combo,Burr Set,1/4 In.,8 pcs., Horsepower 0.3 hp, Collet Size 1/4 in, Grinder Orientation Straight, Max. Speed 20,000 RPM, Air Inlet 1/4 in NPT Female, Includes 8pc. Double Carbide Rotary Burr Set: 1/4 In. Shank in Blow Molded Case, Cylindrical Shape 1/2 In. x 1 In., Cylindrical Shape 3/8 In. x 3/4 In., Cylindrical Radius end 3/8 In. x 3/4 In., Cylindrical radius end 1/4 In. x 5/8 In., Ball Shape 1/4 In., Ball Shape 3/8 In., Tree Shaped radi, Safety Features Safety Lever