The Zt- Zero Tolerance 0770 Assisted Opening Knife Stonewash Elmax Plain Edge blade is an assisted opening folder. Get the style and performance of Zero Tolerance's award-winning 0777 in a slightly smaller, streamlined version. The blade is Elmax steel and provides a razor edge, excellent edge retention, strength, and toughness. The thin aircraft aluminum with a black finish with steel liners. Opens quickly with the SpeedSafe assisted opening mechanism.