In a message dated 6/2/2004 12:53:34 PM Eastern Standard Time, GYoungwolf@aol.com writes: For those interested, the drill size needed was a 17/64", but I have not been able to ascertain the tap size yet. Kit was also 20% cheaper than at the LAPS >>>>>>>>>>>>>> The tap size for the 1/4-20 helicoil is a special size but it is very close to a 5/16-20 tap size. I know they don't make that size! Ken Hand