This tubular-aluminum device extends and locks in any position from 12" to 20". Quickly attaches to any bolt for holding action securely in upright position. Action sets on top of key blocks (use cardboard to prevent marring the finish). Action may be reversed for damper and screw tightening. An important piece of equipment that facilitates work in the home...permits greater accessibility to the action...and lessens the danger of damage from falling.