Boreholes about the surface area in diagonal grid Boreholes to the floor 100x100 mm grid Boreholes around the surface 50x50 mm grid Boreholes about the surface area 50x50 mm grid Boreholes around the surface area 50x50 mm grid The incredibly first thing that we discovered concerning this set is https://precisioncncmachining03467.blogmazing.com/30768898/set-for-lifting-heavy-loads-an-overview