This cable railing drill guide jig dowel is made of high-quality aluminum alloy with an anodized surface, offering precision workmanship and corrosion resistance. The built-in drill sleeve is constructed from stainless steel, providing strength and wear resistance, capable of withstanding hundreds of drilling operations while maintaining accuracy.The drill guide allows drilling at 30, 45, and 90 degrees. When using the drill guide for railing posts, select the desired angle to perform efficient and high-precision drilling, saving time and effort.The drill guide includes four sizes of drill sleeves: 3/8 inch (9.52mm), 5/16 inch (7.93mm), 1/4 inch (6.35mm), and 3/16 inch (4.76mm), compatible with standard cable railing hardware. Choose the appropriate drill sleeve and match it with the corresponding drill bit for accurate results.This drill guide can be used with a variety of fixtures or held manually during operation to prevent movement. It produces clean, burr-free, and crack-free holes. Ideal for DIY woodworking projects including cable railings, deck railings, stair railings, and similar applications.Color: Blue Material: Aluminum alloy Package Contents: 1 x Drill guide set Note: Light reflection and differences in display screens may cause slight variations in color. Measurement error allowed is +/- 1-3 cm.