Drill guides are available in 30degree, 45degree and 90degree drilling angles. Suitable for horizontal deck posts and 45 degree and 30 degree stair railings, is fixed without deviation With four sizes of drilling guide holes for each , 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 screws. An efficient and compact angled drill guide that is easy to carry. This drill guide for drills can be used with C- and F- 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:red Material:Aluminum alloy Package Contents: 1 x Drill Guide Only the above package content, other are not included. Note: Light 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.