Abstract: A knife comprises a handle, a blade having a blade back, and a hook integral with the blade. The hook includes a hook body extending laterally outwardly from the blade back side of the knife blade. A finger of substantially constant diameter and with no sharp edges extends rearwardly toward the handle from the outward margin of the hook body. The finger preferably has a length of at least about 0.2 inches and is displaced laterally outwardly from the adjacent portion of the knife back by a distance of at least about 1/4 inch. The finger is oriented at an angle to the handle of at least about 5 degrees. A slot defined by the hook body, the finger, and a portion of the blade back includes a straight cutting edge oriented at 90 degrees to the finger, and centering ramps that guide the material being cut into the cutting edge.

Abstract: A nailer for repeatively driving nails one at a time into material. A safety yoke including an integral safety yoke lever cams against a safety yoke pin in the body of the nailer and actuates a secondary trigger pivotally mounted in a trigger. The secondary trigger actuates a valve plunger in a trigger valve assembly releasing the air over a poppet assembly, causing downward movement of a pneumatic piston assembly carrying a driver blade driving a nail held in a channel guide of a nose into the material. A plurality of tabs on the nose mechanically engage and frictionally lock a nail magazine to the nose. A scroll spring assembly affixes to the nose and biases a pusher in an adjacent track of the magazine towards the nose. A safety yoke detent biased away from the nose moves forwardly into a detent notch in the safety yoke by the pusher when the supply of nails remaining in the magazine reaches a predetermined number.