Drill guides are available in 30degree, 45degree and 90degree drilling angles. Suitable for 90 degree horizontal deck posts and 45 degree and 30 degree angle stair railings, angle is fixed without deviation With four sizes of drilling guide holes for each angle, 3/8inch(9.52mm), 5/16inch(7.93mm), 1/4inch(6.35) mm), 3/16inch(4.76mm), each compatible with most cable railing cable protector sleeves and lag screws. An efficient and compact angled drill guide that is easy to carry. This drill guide for angle drills can be used with locking C-clamps and F-clamps to prevent the drill from wobbling while drilling and allow burr- and crack-free holes to be drilled. perfect for installing wood, aluminum and stainless steel posts and deck railings, cable railings, stair deck railings and DIY railing projects. Colour:Blue Material:aluminum alloy Package Contents: 1 x Drill Guide 4 x Drill Bit 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.