Abstract: An attachment for a power tool which permits a fastener being driven-in by the power tool to be held in a stable condition. The attachment includes a channel with an aperture in the web. The nose of the power tool fits in this aperture and can be secured therein. Each flange of the channel has a slot therein and a slide element passes through these aligned slots. The slide element has a keyhole opening therein formed by an aperture and a contiguous slot. The aperture is dimensioned to permit the head of a fastener to pass therethrough and the slot is dimensioned to receive the shank of the fastener. The head of the fastener cannot pass through the slot. By moving the slide element either the slot or the aperture therein can be aligned with the aperture in the web. A spacer can be provided for engaging the surface into which the fastener is to be driven. The spacer can be adjustable in position with respect to the channel.