Surface Grinding Segment Abrasive Material Aluminum Oxide Compatible Chuck ME100703B Cortland Compatible Tool Type Vertical Spindle Surface Grinder Grit 30 Overall Length 8 in Overall Thickness 3 in Overall Width 11 1/4 in Primary Material Applicationn Brass Bronze Cast Iron Steel Tool Steel Specification GEMINI 30-I Wheel Type Type 31 Series Gemini 53A