Tactical Scorpion Gear Set of Four AR500 Steel Shooting Target Gong 10" x 3/8" Two 1/2" mounting holes ( With thick ears to take hits without breaking) Hang from both holes for more stability but you can hang from a single hole We utilize a CNC laser cutting table for the cutting of all our AR500 products. Package Contents: Four 10" x 3/8 Ar500 steel Gong 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.