DewEze 7 groove serpentine belt clutch pump system “AA” mount tapered 5″ Warner electric clutch 12vdc.NOTE TO INSTALLER Clutches will need a short burnishing period to generate the rated torque. This is a process of cycling the clutch to slightly wear the friction surfaces. This allows full contact and maximum magnetic attraction required for rated torque (or more).BURNISHING-TO AVOID BURNING OR HEAT DISTORTION, THE FOLLOWING PROCEDURE IS RECOMMENDED:After clutch is installed, run at 1000-1200 RPM. Cycle the clutch on/off at the rate of 1 seconds on – 1 seconds off for a minimum of 30-40 cycles. Grooves: 7 Diameter: 5 Brand: Warner Model Number: 1417-42 Center Bolt Size: 1/14-20 x 3/4 Bolt Kit: 713001 Coil: 732029 Hub:740164