Dear sirWe are manufacture and exporter of Helicoil insert and tool, tap,kits in Korea.Our Thread insert ( Helicoil insert ) are precision formed screwthread coils of diamond-shaped 304 stainless steel wire.When installed into tapped holes by Helicoil tap, screw threadinsert ( Helicoil insert ) provide permanent conventional internalscrew threads of any bolt and screw also exclusive Helicoil tap,Installation tool, remove tool are available1. Type is free running and locking type with 5 different length of1D and 1.5d, 2d, 2.5d,3d2. Material . 304 stainless steel - standard andgeneral purpose . 316 stainless steel . Phosphor Bronz - electricalconductivity . color ( plating ) - availableGold, verification of Insert installation3. STI tap4. Installation tool - Hand tool and Prewinder tool, removaltool5. Helicoil Kits are available from M3 to M14