aquarium acrylic drilling, will update if any problems, this thing looks very sharp. You need this type, to accurately drill a hole in acrylic m to use to drill a 1.875" diameter pilot hole for a 1" NPT bulkhead fitting. Use water as a coolant and do not allow it to get hot, you want to cut not melt. Use Use a drill if possible Slow is control Slower spindle speed When drilling on a drill, use a scrap piece of wood or acrylic or something on the back to prevent chipping Be very careful whenβ¦