The 2691 is a 4 x 105mm ergonomic SoftFinish? multi-component Telescopic Handle with roll-off protection and 4mm hexagonal retainer for all SYSTEM 4 reversible blades and adapters. Enables adjustable blade length from 18 to 90mm. Click-stop ball clamp guarantees a secure hold and rapid blade exchange. Ideal for all precision work in the fields of electronics and mechanics.