Tactical Scorpion Gear TSG-GG1220-2 AR500 12" x 20" IDPA ISPC 3/8" Steel Shooting Target Gong Laser Cut - Lot Of Two Two 5/8 mounting holes and one square hole to accept 1/2 carriage bolt Hang from both holes for more stability but you can hang from the single square hole We utilize a CNC laser cutting table for the cutting of all our AR500 products. There is no better method Package Contents:Two 12" X 20"x 3/8 IDPA @/3 Ar500 steel target All of our 3/8" targets carry a limited lifetime guarantee from breakage 3/8 AR500 steel targets work great for the following calibers 223, 5.56, 5.4539, 7.6239 and 308. For velocities over 3000fps MV use at 200 yards minimum. Handguns should be used no closer than 10 yards and rifles 100 yards.