Cordless rotary SDS hammers
If hard concrete is what you're dealing with, a rotary hammer is what you need. Unlike normal hammer drills that produce small percussive motions, rotary hammers’ air-powered piston delivers high energy shots to the rotating bit.
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20V 2.0J Rotary Hammer Drill - Balanced in size and power
20V Powershare 4700bpm 2.0J Cordless Brushless Rotary Hammer Drill - Tool Only - WX381.9
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H3 SDS Rotary Hammer Drill
20V PowerShare Cordless Rotary Hammer Drill 6400bpm 1.2J H3 with 2.0Ah Battery and Charger - WX391
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20 V 1.2 J rotary hammer - Lightweight design
20V PowerShare Cordless Rotary Hammer Drill 6400bpm 1.2J - Tool Only - WX391.9