E Z LOK Drive Tool Optional Use with 329 4, 329 401, 329 428, 303 4, 303 428, 319 4, 319 428, 335 4, 450 6, 550 1420, 650 6, 400 4, 400 428, 400 M6 500 3 hidden High Temperature Resistance: They are Style:1 FT High Temperature Resistance: They are compatible with a wide temperature range as low as 73C ( 99F) and as high as 300C (572F) highly bioavailable and better tolerated thanks to the iron form used Drive Tool For E Z LOK Threaded InsertsThe E Z LOK Threaded Insert Drive Tool speeds up the installation of threaded inserts without engaging internal threads THREADED INSERT INSTALL TOOL E Z LOK Threaded Insert Drive Tool speeds up the installation of threaded inserts without engaging internal threads