Abstract: A rotary power tool holder, particularly a holder for rotary power handsaws, has a bottom wall including a longitudinal slot for the circular saw or tool element. A side wall parallel to the slot has a projection to engage the tool guard. This projection can be varied to accommodate different guards, its distance from and height above the slot can be varied to accommodate different rotary power saw models. The breadth of the slot can be altered to let the saw sit lower. The projection may be adjustable in height. Both bottom wall and side wall are attachable to substrates. Tool receiving recesses may be provided on the side wall away from the slot, which form sockets when the side wall is attached to a substrate.