Red Hound Auto Quick Change Bit 19 mm or 3/4" Impact Driver Hex Socket Magnetic Nut Driver RV Lift Tack Trailer Stabilizer Leveling Scissor Jack Socket Quick Change Bit; works on both 19mm or 3/4" Hex Head Scissor Jack RV Trailer Stabilizers Reduces time and effort to raise or lower your scissor jacks The 1/4" Hex drive quick change shank will allow this versatile bit to work in a quick change chuck, or can fit in all 3/8" or 1/2" power drills with traditional keyed or keyless chucks on cordless or corded drills and impact drivers Works with 3/4" hex drive jacks, using power drill torque to raise/lower jacks Constructed of heavy duty chrome plated carbon steel