Drill guides are available in 30-degree, 45-degree, and 90-degree drilling angles. Suitable for 90-degree horizontal deck posts and 30-degree and 45-degree angle stair railings. The angle is fixed with no deviation. Each angle features four drill guide hole sizes: 3/8 inch (9.52mm), 5/16 inch (7.93mm), 1/4 inch (6.35mm), and 3/16 inch (4.76mm). Each size is compatible with most cable railing protector sleeves and lag screws. This compact and efficient angled drill guide is easy to carry. It can be used with locking C-clamps and F-clamps to prevent drill wobble, enabling clean, burr-free, and crack-free holes. Ideal for installing wood, aluminum, and stainless steel posts and deck railings, cable railings, stair railings, and DIY railing projects. Color: red. Material: aluminum alloy. Package includes: 1 x drill guide. No other items included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.