This cable railing drill guide jig dowel is made of high quality aluminum with anodized surface, precision workmanship and corrosion resistance. The built-in drill sleeve is made of stainless steel, which is strong and wear-resistant, and can withstand hundreds of drilling operations while still maintaining accuracy. The drill guide can be drilled at 30, 45 and 90 degrees. When using the drill guide to drill the railing post, select the angle, and you can complete an efficient and high-precision drilling operation and save your work time. The drill guide has four sizes of drill sleeves for each angle, 3/8inch (9.52mm), 5/16inch (7.93mm), 1/4inch (6.35mm), 3/ 16inch (4.76mm), compatible with most cable railing screws, select the appropriate drill sleeve to match the corresponding drill bit to complete the drilling. This drill guide can be used with a of fixtures, or you can to hold the drill guide with your hand to prevent shaking during drilling, the drilled holes are free of burrs and cracked.This drill guide is perfect for DIY woodworking projects like cable railings, deck railings, stair railings and more. Colour:blue :Aluminum Gloves: random color style , 't accept the specified Package Contents: 1 set x drill guide Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.