Forged, single-piece solid steel. Allows keying and shaping of masonry. Octagonal shaft. Accepts 25mm / 1″ combs. Compatible with Silverline Scutch Set 3pce. Forged, single-piece solid steel. Allows keying and shaping of masonry. Octagonal shaft. Accepts 25mm / 1″ combs. Compatible with Silverline Scutch Set 3pce.