... 4. Use M42 x 10 x 1.5 threaded hole of both sides of carriage, which added with carried ... rods, as fixed points to drill anchor hole; can also select (XQ) sled support to drill 0 ... °- 90°blast hole;5. Or with stand column to drill 0°- 360 ... °blast hole, vent hole and weep hole, in underground and waterway; it is your good ...