Hole Diameter: 3.4mm<P> Tip Diameter : 8.3mm<P> For Most Stihl Chainsaw such as: <P> MS260 MS290 MS310 MS340 MS360 MS380 MS381 MS390 MS440 MS441 MS460 <P> MS640 MS650 MS660 MS880 026 029 034 036 038 039 044 046 066 088 Chainsaw Models<P> MS170C MS171 MS180C MS181/C MS201/C MS201T MS210C Chainsaws<P> Also Fit Stihl TS400 TS410 TS420 TS650 TS700 TS760 TS800 Concrete saws </P>