Racing Kart, Clone, Predator, Hemi, Honda, Briggs, BSP most Motorcycles or engines if they have. A 4.5, 5, 5.5, 6,7 mm, 1/4 mm valve stem, If you are building or rebuilding your own small engines, either for performance. Or just a quality rebuild, this gives you control of cutting your own valve seats you can do a. Standard 45 degree seat or even 3 angle. Seat with this set… You can move the sealing surface on the seat for best performance.. This is ONLY if you have 4.5, 5, 5.5, 6,7 mm, 1/4 valve stems. This kit comes with the following. Valve Seat Cutter Kit Carbide Tipped. 3 Angle Cut As Original Seat. Milling In The Following Sizes. 1st Top Angle & 2nd Base Angel Cutters. 22 mm 30 Degree & 45 degree. 30 Degree & 45 degree. 3rd Throat Angle Cutters. 23 mm 60 degree. 25 mm 60 degree. 28 mm 60 degree. 30 mm 60 degree. 32 mm 60 degree. 30 Degree & 45 Degree Cutters are Usable From Both Side As Other Side Is Grounded At 90 Degree. 6 Stem Guide’s Sizes. 4.5 MM – 5 MM – 5.5 MM – 6 MM – 7 MM – 1/4. 6 High Speed Steel Reamer’s Size. 1 Tap 3/8 UNF 24 TPI. Total 44 Pcs Set. In A Vintage Style Wooden Box.