Effective length: 3.9 inches (100 mm); Compatible electric motors; Hammer drill; Compatible material concrete, blocks, brick; Features: Powerful striking power and smooth transmission of rotational force; Speed drilling of rebar concrete (up to 3 minutes) The ultra-thin body uses a double spiral to avoid the dispersion of the perforation caused by shavings. The drill speed is increased by 20% than previous versions, and the shank size is up to 17.7 inches (450 mm), so it can be used with thick concrete. Compatible Hammer Drill Manufacturer Model Number: Hitachi PR25B Makita HR3520 DH35 HR3530 PR38E HR3850 DH40SA HR3811 DH40SR HR4030C DH45SA Ryobi ED-383N DH42 E3D-8D-8 2NA ED-3 82NPA / HC Type (Guide Plate Only) Model Number Diameter (mm) Part Number Diameter (mm) HCGP-32 32 HCGP-75 75 HCGP-35 35 HCGP-80 80 HCGP-38 38 HCGP-95 95 HCGP-45 45 HCGP-105 HCGP-5 0 50 HCGP-110 110 HCGP-55 55 HCGP-120 120 HCGP-60 60 HCGP-130 130 HCGP-65 65 HCGP-150 150 HCGP-70 70