Comparison : Item # 421-35005, 6" x 1/2" x 1" Type 1 Green Silicon Carbide GC60-I-V Bench & Pedestal Wheel
Item # 421-35006, 6" x 1/2" x 1" Type 1 Green Silicon Carbide GC80-I-V Bench & Pedestal Wheel
Item # 421-35007, 6" x 1/2" x 1" Type 1 Green Silicon Carbide GC100-I-V Bench & Pedestal Wheel
Item # 421-35008, 6" x 3/4" x 1" Type 1 Aluminum Oxide A24-Q-V Bench & Pedestal Wheel
Item # 421-35009, 6" x 3/4" x 1" Type 1 Aluminum Oxide A36-O-V Bench & Pedestal Wheel