The Safety Set for the CZ Scorpion EVO 3 S1 adds additional width over the standard factory safety, allowing for more positive engagement and leverage during engagement or disengagement. The Safety Set is made from 6061 aluminum, hardcoat anodized, with a machined indicator line. 1) Direct drop-in replacement of factory safety 2) Install using a 1.5mm allen wrench(not included) 3) Maintains factory safety values 4) Approximately 0.095" wider than factory specifications 5) Weighs approximately 10 grams per side 6) Not compatible with all folding stocks Mfg: Apex Tactical Specialties Inc SPECS: Finish: Black, Material: Aluminum, Hand: Ambidextrous, Style: Extended.