Important - The Brass thread repair insert is a tapered fit! 10x Brass thread repair inserts, mild steel bleed nipplse & rubber nipple caps Insert external threads = 1/8x27 NPT (Requires a 21/64 Drill bit - Not supplied) Insert internal threads / bleed nipple threads = 1/4x28 unf Suitable for most calipers, including - Willwood, ATE, Akebono, Advics, Brembo, Bendix, Bosch, Girling, TRW and many more Kit contents pictured Frentech repair parts are manufactured to premium quality standards.