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Step Drill - For Drilling and Countersinking 82° Flat Head Machine Screw Clearance Holes  E-mail this product to a friend previous | up | next  Screw Size Minor Diameter Major Diameter Step Length Jobber Length Flute Length Overall Length EDP No. No. .128 "F" 3/8 2-7/8 4-1/8 317638 No. .142 9/32 1/2 2-15/16 4-1/4 317639 No. .169 "Q" 1/2 3-7/16 4-3/4 317640 No. .196 "W" 5/8 3-3/4 5-1/8 317641 1/4 .257 1/2 11/16 4-1/2 6 317642 5/16 .320 5/8 3/4 5-3/16 7-1/8 317643 3/8 .383 3/4 7/8 5-5/8 7-5/8 317644 7/16 .446 13/16 1 3-3/8 5-1/4* 317645 1/2 .510 7/8 1 3-1/2 5-1/2* 317646 *Shorter than Jobber Length SETS Jobber Length - EDP No. 173566