for thread repair of damaged or worn-out threads for new high stbale and long-lasting internal threads perfect for maintenance and installation the repair is carried out in just a few steps drill out the damaged thread with the twist drill use the special tap to cut the internal thread into the drilled hole to install, place the thread insert on the installation tool and screw it in the thread insert with light pressure the use of cutting oil is recommended scope of delivery: 1 HSS twist drill | core hole size 20.4 mm | for BGS 9434 (BGS 99434-1) 1 STI short machine tap | HSS-G | M20 x 1.5 mm 1 inserting tool with locking ring 5 thread inserts | M20 x 1.5 mm Technical data Gross weight1028 g For thread/inclineM20 x 1,5