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See more product details TIPS: Please wear goggles and gloves when you are doing carpentry or other works with these hole saws. Available Machines: Electric drill, Impact drill, Bench drill,etc. Recommended Drilling Speed: RPM≤1200 (it is meant for extending their service life). Please let the hole saw drill through naturally when boring a hole. Do not make a forced press. only for soft wood and thin plywood you need to take out a mandrel first, then slip a hole saw of preferable size in, and finally screw the nut on them.







