Important - The Brass thread repair insert MUST be sealed with thread lock 2x Brass thread repair inserts, mild steel bleed nipples & rubber nipple caps Insert external threads = M10x1mm (Requires an M9 Drill bit & Thread locking compound - Not supplied) Insert internal threads / bleed nipple threads = M6x1mm 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.