See-Thru Case: High-grade polycarbonate housing is lightweight, always crystal clear, and impact resistant. Convenient: 1 in. blade with 2-sided, horizontal and vertical, high contrast printing and double-sided end hook for measuring from any angle. High Accuracy: SAE measurements with fractional numbers every 1/8 in. and markings to 1/32, ensure fast, easy reading. Smooth Operation: Auto-retracting blade glides both in and out thanks to the high-carbon, heat-treated, rewind spring. Quick Locking: Easy to operate thumb lock secures blade tightly until it is released to retract the tape.