6 Pieces Stainless Steel Bore Brush in Different Sizes Twisted Wire Stainless Steel Cleaning Brush with Handle 1 4 Inch Hex Shank for Power Drill Impact Driver, 4 Inch in Length 8 mm, 10 mm, 12 mm, 15 mm, 17 mm, 19 mm auspowers_batchone easy to replaceDesigned: 8 hole de B0CXN3LZHJ easy to replaceDesigned: 8 hole Avoid cloggingGrit: 60 80 120 180 240 400 600 and 800 sandpaper grit Package Includes 1 x 5 inch sanding pad(M10 thread)1 x 3 8 round shank1 x 1 4 hex quick change shank10x 60 5 inch Sandpaper disc10x 80 5 inch Sandpaper disc10x 120 5 inch Sandpaper disc10x 180 5 inch Sandpaper disc10x 240 5 inch Sandpaper disc10x 400 5 inch Sandpaper disc10x 600 5 inch Sandpaper disc10x 800 5 inch Sandpaper disc 3V Electric current: 50MA 14 Digital I O Pins (6 PWM outputs) 8 Analog Inputs 32k Flash Memory Package included: 1 x CNC Shield Board 1 x KeeYees Board 4 x A4988 Stepper Motor Driver with Heat Sink 1 x Female DC Power Cable 4 x Mechanical Switch Endstop 20 x 2 and do not turn counterclockwise Each brush has 4 inch in length and 1 4 inch hex shank to be mounted on any power drill or die grinder (not included)