Hilti TE-YX SM/FM 36 Chisel Set, Pack of 4 (2 Pointed, 2 Narrow-Flat) SDS-max (TE-Y) Self-Sharpening Chisel bits for Demolition of Concrete and Masonry, Dimensions: 360 mm Long (2241997)

Strong and rigid set of 4. Like hot knife through butter. Pretty stable and built to last, no obvious blunt over a few jobs. TE-Y fit and seems goes well with my Bosch. Reasonable at under £154 for the premium quality. No resharpening or harding needed.

Thus set of chisels is absolutely brilliant at breaking up concrete. Used in my sds max demolition drill. Use it on rotor stop setting and just watch it break-up strong concrete and cement. Has flutes down the sides for the dust to move along out of the hole. Stays sharp for a long time. I demolished an old extension with one of these chisels. They are expensive but last ten times longer than some other brands.