External Holders for pos. Inserts External Mini Holders Back-Turning Tool Holder SBT Type Sharp cutting edges with good surface finish. Max. reach of insert 8,0mm, edge width 2,5mm Cut-off Tool Holder SCT Type Easy insert change by just loosening the screw from the back. Max. cut-off dia. Ø5mm, Ø12mm, Ø16mm Wear-resistant tool materials; T1500A (Cermet) and AC530U (2000 layers Sharp cutting edge coated carbide grade) ( r = 0,03 0,1 and 0,2 mm ) PDJCR type Lever lock clamping lever lock holder for 7°positive inserts Easy access side locking screw D28