This is a large set of 6 Heavy Duty Tungsten Carbide (TC) Chisels in four sizes: 2/5" (10mm), 1/2" (12mm), 9/16" (14mm) and 5/ 8 inches (16mm). These chisels are made of heavy gauge alloy steel with knurled tips and measure 9 1/16 inches overall. The 2 included scraper blades have 3" and 4" wide sharpened/detachable flat blades. These tools must be used with a hammer drill that accepts Spline Drive System (SDS) shank bits and has a "hammer" setting with no rotation, just impact. The impact drill delivers impacts in the direction of rotation; The hammer delivers an impact parallel to the chisel without rotation. For the major remodeling job, contractor or home renovator, these are excellent quality bits that will shatter tile or mastic bonded floors without significant damage to the subfloor if used carefully. Much easier than a hammer, chisel or scraper on a small vibrating multi tool! Figures 1 and 2 show the set in a hard aluminum case lined with foam. Figure 3 shows a detail of the SDS shank and bit with the TC insert visible. In photos 4 and 5 the scraper blade is mounted on my SDS impact drill. I highly recommend this RVIQI Brand SDS Plus 6 Piece Floor Scraper Tool and Alloy Impact Drill Bit Groove Scraper Wall Scraper for Tile Brick Stone Concrete Adhesive Remover with Heavy Duty Body. Heavy duty tools well made for use with the SDS hammer drill only. I hope you found the information and my review helpful.