ITEM NAME:3/8"-7T Clutch Drum & Sprocket Rim fit for Stihl 066 MS660 064 Chainsaw Hf 0.375" 7 Teeth Clutch Drum & Sprocket Rim 3/8-7 T Fit for Stihl 066 MS660 064 Chainsaw SPECIFICATIONS.0.375" 7 Teeth Clutch Drum & Sprocket Rim 3/8-7 T Fit for Stihl 066 MS660 064 Chainsaw. 1 x 3/8-7 T Sprocket RimCompatible With: fit for Stihl 066 MS660 064 Chainsaw. 1 x 7T Clutch Drum. Sprocket Rim Size: approx.