The Strike Industries Selector Switch for CZ Scorpion EVO is both an ambidextrous and non-ambidextrous package (3-pieces) which allows the shooter to configure the setup needed while adding short but wide easy-to-reach controls. Grooves are designed onto the selector switches to ensure control even in wet conditions. Retain factory ambidextrous controls or use the included optional third piece if you want the selector switch only on one specific side. Made from durable and lightweight polymer” this drop-in SI Selector Switch is a perfect pairing with the 15 degree angle of the Strike Industries Pistol Grip for CZ Scorpion EVO (sold separately) and will give you improved ergonomics over the originally designed CZ factory parts and especially no pinched fingers.