SEALEY PREMIER - One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. ROBUST - Manufactured from a durable rubberised ABS body designed for rigorous work. WINDOW WITH MEASUREMENT IDENTIFIER - Allows for accurate inside measurements without bending the blade. DOUBLE-SIDED BLADE - With Metric measurements. AUTO-LOCK - Extended blade is automatically locked, and a press-button controls rewind for ease of use.