Fits valve guides with 5/16" (7.9375mm) valve stem. Cutter bodies and pilots are interchangeable, Hardened pilots fit all 3/8 and ½ hand drills. Valve seat spring cutters: - 707258 .625" ID x 1.565" OD - 707259 .625" ID x 1.635" OD - 707260 .625" ID x 1.750" OD - 707261 .550" ID x 1.180" OD. Cutter uses the following Pilots: - 707265 Fits valve guides with 3/8" ( 9.53mm) valve stem, 48-83 Pan & Shovel - 707263 Fits valve guides with 5/16" (7.9375mm) valve stem, 84-99 Evo B.T.; 99-04 Twin Cam and 86-22 Evo XL - 707264 Fits valve guides with 7mm valve stem, 05-17 Twin Cam - 707262 Fits valve guides with 6mm valve stem, 17-up M8 - 707266 Fits valve guides with 11/32" (7.7313mm) valve stem. Valve guide OD cutters: Used to cut the valve guide outer to correct outer diameter. - 707268 .420" OD for Feuling seals 566045 (84-99 Evo Big Twin; 99-04 Twin Cam; 86-03 XL Sportster) - 707269 .500' OD for Feuling seals 566048 (.500" OD guides with 5/16" stems) - 707270 .530" OD for Feuling seals 566047 (H-D with Screamin' Eagle cylinder heads with .530" OD guides with 5/16" stems). Note: Special Order Product only. To order please contact your MCS sales representative.