Hitachi 728800 SDS Max 3/4-Inch Hex 21/32-Inch Round 3/4-Inch Hex Shanks 5-Inch x 5-Inch Tamper Plate Measures 5-inches by 5-inches to 1-inch I.D Made of high quality carbon hardened steel High tolerance milled shank provides a perfect fit CNC controlled manufacturing ensures 100-percent quality consistency Comes with a 30-day limited warranty High Quality Carbon Hardened Steel High Tolerance milled shank provides perfect fit CNC Controlled manufacturing ensures 100% quality consistency