® DSI Thread Turning Toolholders Heavy Duty Thread Turning Toolholders External Ordering CodeRight HandH B L F Insert Anvil TorxScrewScrewKeyRHAnvil LHAnvil SER 2020 K16U-6 20 20 125 20 S16 A16 K16 AER 16U-6 AEL 16U-6 SER 2520 M16U-6 25 20 150 20 S16 A16 K16 AER 16U-6 AEL 16U-6 For LEFT HAND toolholders specify SEL instead of SER Internal with coolant bore Ordering CodeRight Hand D Min.bore dia.L F Insert Anvil TorxScrewScrewKeyRHAnvil LHAnvil SIR 0020 P16UB-6 20 24 170 14.9 S16 A16 K16 AIR 16U-6 AIL 16U-6 SIR 0025 R16UB-6 25 29 200 17.4 S16 A16 K16 AIR 16U-6 AIL 16U-6 For LEFT HAND toolholders specify SIL instead of SIR A03-6