Draper Extra Long Metric Hexagon Key, 19mm

Amazon

Manufactured from hardened and tempered chrome vanadium steel with chemically blacked finish and chamfered ends Keys are designed to resist rotational distortion Chemically blacked protective finish Hardened and tempered with chamfered ends, Weight: 0.4629707502 Pounds, Manufacturer: Draper

ManoMano

Manufactured from chrome vanadium steel that’s hardened and tempered then applied with a chemically blacked protective finish and chamfered ends This is a Draper product.

Electrical World

Manufactured from chrome vanadium steel that's hardened and tempered then applied with a chemically blacked protective finish and chamfered ends.