Surface Grinding Segment Abrasive Material Aluminum Oxide Compatible Chuck ME30777 Cortland Compatible Tool Type Vertical Spindle Surface Grinder Grit 30 Overall Length 6 in Overall Thickness 2 1/4 in Overall Width 11 1/4 in Primary Material Applicationn Brass Bronze Cast Iron Steel Tool Steel Specification GEMINI 30-F Wheel Type Type 31 Series Gemini 53A