This step drill by make-2-fit is constructed of hardened steel and features two diameters in one, specifically for use when installing aluminum screen plunger bolts, It is used to drill 2 different diameter holes in one single pass for installation of screen plunger bolts into the screen frame. The drill diameters include a 1/8 in. and a 7/32 in. bit diameter, and teh larger diameter is only intended to pass one layer of the hollow screen frame. For the best results, follow the installation instructions included in each package. Used to Easily Drill Correct Hole Sizes | 1/8 in. and 7/32 in Diameter x 3-3/4 in. | Zinc in Color | Steel Step Bit.
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