The Searchoice SC2806 3/16x1/2BLDRVT 6-8 ALUM 100/BG is a 6-8 inch diameter, 100/bg aluminum shaft, 3/16x1/2 inch bore, single-ended rotary tool with a 6-speed transmission. It has a 3/8 inch collet chuck, a 1/4 inch collet chuck, and a 1/2 inch collet chuck. It has a 1/4 inch drive gear, a 3/8 inch drive gear, and a 1/2 inch drive gear. It has a 3/8 inch spindle, a 1/4 inch spindle, and a 1/2 inch spindle. It has a 3/8 inch arbor, a 1/4 inch arbor, and a 1/2 inch arbor. It has a 3/8 inch work wheel, a 1/4 inch work wheel, and a 1/2 inch work wheel. It has a 3/8 inch work face, a 1/4 inch work face, and a 1/2 inch work face.