The Bosch 2608590090 (CYL‑1) Masonry Drill Bit Set is a compact and utility-focused 5-piece accessory kit tailored for hammer‑ or impact‑drill use on concrete, brick, stone, and block work. The set includes straight‑shank sizes in 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm, with working lengths ranging between 40 mm and 80 mm depending on diameter. Each bit features an HSS body with brazed carbide tip and optimised 2‑flute U‑shank geometry that enhances dust extraction and reduces heat during drilling—“the CYL‑1 Drill Bit is optimised for drilling in masonry. Its 2‑flute U‑shape provides good dust removal while its standard carbide tip makes the bit more wear‑resistant” . The bits are fully compatible with both rotary hammer drills and impact‑driver tools that accept straight or hex‑shank bits, although this set is sold with a straight round shank (no case included). Since these items are consumable accessories, Bosch does not extend its standard 1‑year professional warranty to them; support coverage—if any—is typically limited to seller return policies.