Ko-ken Tools Special 4mm Half Moon Adaptor, Size 1/4"Hex (Quick Release)Custom 4mm Half Moon Adaptor for Atlas Copco Micro Torque Tools. Only fits Atlas Copco Micro torque tools: ETD M 08 ABL V2 ETD M 20 ABL V2 ETDM 27 ABL V2 ETDM 50 ABL V2 ETD M 80 ABL V2 QMC 21 05 HM4 QMC 21 10 HM4 QMC 21 25 HM4 QMC 41 50 HM4 QMC 41 100 HM4 ETD MT 21 25 HM4 ETD MT 41 50 HM4 ETD MT 41 100 HM4 ETF MT 5 ETF MT 10 ETF MT 20 ETF MT 50 ETF MT 80 ETF MT 100 HM4