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The General Tools and Instruments 714 Quick Check Screw Gage is a quick way to check thread and screw sizes. Quickly identify machine screws, bolts, wood screws, standard sized rivets and common cotter pin sizes. The 3 inch scale allows checking of screw lengths. Checker also gives required drill size for corresponding tap size and proper drill size for like hole. Threaded holes indicate threads per inch while unthreaded indicates size by number and fractions of an inch. The checker is engineered with durable engineering plastic.GENERAL TOOLS - THE PRECISE TOOL FOR DOING THE JOB EXACTLY RIGHT. Offering over 1,000 tools, we’re proud to provide tradesmen, craftsmen and DIYers around the world with a broad range of affordable, specific-purpose mechanical hand tools and precision measuring and inspection tools. For inquiries, please contact our Customer Service Department at 212-431-6100. We strive to provide our customers with 100% satisfaction. WORK SMARTER, MEASURE BETTER & BE MORE PRODUCTIVE WITH GENERAL TOOLS