Tap And Drill Reference Table, General Tools 715. GN715 Features: -Reference table. -Essential tap drill and decimal equivalents reference table for toolmakers, machinists and mechanics. -Front has machine screw size tap drill chart for recommended 75% depth thread. -Back has decimal equivalents table in 64ths from 0.02'' to 0.98''. Dimensions: Overall Product Weight: -0.01 Pounds. DOUBLE SIDED TOOL: This guide features a Tap Drill Depth Chart, decimal conversions from 1/64" to 63/64" and a ruler graduated in 64ths FRONT SIDE: Front side has a machine screw size tap drill chart for recommended 75% depth thread. BACK SIDE: Features a decimal equivalents table in 64ths from 1/64" to 63/64". 6 INCH RULER: Graduated in 64ths. WORKS WITH: National Fine, National Course, American Standard Pipe and metric threads. ESSENTIAL TOOL: Essential tap drill and decimal equivalents reference table for toolmakers, machinists and mechanics. GENERAL TOOLS: We're a recognized leader in designing and developing specialized precision tools dedicated to delivering exceptional customer service. We encourage artisans and DIYers to work smarter, measure better, and repair more productively.