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Your cart is empty.All metal design no plastic 3 Blade Stone Hone 240 grit Aluminum Oxide Stones, 4" long x 1/2" Wide Stones Hone designed to expand from 2" Diameter Bore to 7" Diameter Bores Perfect for de-glazing bore prior to re-ring Protective Collar prevents stone breakage and controls force of tool on cylinder walls Flexible shaft improves tool centering and alignment Removable/replaceable hone stones to use tool with other grits Fits 3/8" or 1/2" chuck portable drills or drill presses Tension adjustment knob for controlled cut If used in rigorous motion can provide 45 degree cross hatch Tool is plated for long life and nice appearance Grinding stone dimensions: 4 1/16" L, 1/2" W, 5/16" H Overall dimensions: 12 1/4" L x 7 1/4" W x 1 13/16" diameter (closed storage diameter)