This wedge is a beast! Forged in Germany from high-quality aluminum, the Ochsenkopf Alu Wedge is for felling and splitting big timber. Longitudinal grooves on on the front and back sides prevent 'jerking back' of the wedge under load. Designed specifically for hard (or frozen) wood. The aluminum wedge itself is hollow and has a replaceable wooden shaft inserted into the base - no vibration when driving with a hammer - the aluminum ring around the head of the wooden shaft helps to prevent splintering. 45mm lift - enough to tip over the biggest piece of timber with ease and the wedge with wooden shaft is long enough not to get buried in soft bark trees when hammered.