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KM straight shank twist long drill d L l Z Φ2(L=42, l=10, Z3 ) 42 10 3 Φ2.5(L=44, l=12, Z3 ) 44 12 3 Φ3(L=44, l=12, Z4 ) 44 12 4 Φ3.5(L=47, l=15, Z4 ) 47 15 4 Φ4(L=51, l=19, Z4 ) 51 19 4 Φ5(L=58, l=24...