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BlackStar 2-3V600SH STL - QD Sheave Metric-Power V-Belts "name": "What does the XHThe BlackStar 2 3V600SH STL is a 2 groove qd sheave for 3V section belts, manufactured from cast iron. Requires a QD Type SH Bushing (sold separately). Specifications Part Number 2 3V600SH STL Product Type QD Sheave Number of Grooves 2 Belt Profile 3V Outside Diameter 6. 00" Bushing Required QD Type SH Bushing Material Cast Iron Approx. Weight 4. 800 lbs Pitch Diameter 60. 0" Compatible Belts 3V Bushing Required This sheave requires a QD Type SH