Mechanical / Knobs and handlesets Knobs and handlesets Yale offers the best choice of knobsets, suitable for any environment and need. The brand includes: cylindrical and tubular knobsets and security deadbolts. Cylindrical knobsets - Grade 2Yale offers a range of heavy duty cylindrical knobsets in a variety of designs, functions and finishes suitable for both internal and external doors. This range conforms to ANSI Grade 2 test... Cylindrical knobsets - Grade 3 Security deadbolts Decorative handle knobset