Bare-Tool Hitachi DH18DLP4 18-Volt Lithium-Ion SDS Plus Rotary Hammer  (Discontinued by Manufacturer),Hitachi,DH18DLP4" /> Tool body compatible with all HitachiLithium Ion, NiCd and NiMH 18V batteries Electro-Pneumatic mechanism produces 1 ft-lb of impact energy Two-Step speed switch- Power Mode for fast and efficient drilling in larger diameters, and Save Mode to conserve battery power and prevent bending of small diameter bits Idle strike restrictor prevents no-load hammering and eliminates uneccessary wear on integral parts Slip clutch protects user, as well as tool gears, in the event of a bound bit