1/4" hexagonal profile; made of the highest quality S2 alloy steel, which in combination with a hardening process guarantees maximum strength and at the same time great flexibility; cold hardened to a hardness of 58-61 HRC; resistant to deformation and cracking; the elongated 50mm profile facilitates work in hard-to-reach places; the colour code facilitates quick identification of the screwdriver bit type; DIN 3126 compliant; packed in pairs in a practical, reusable packaging, for convenient storage, reducing the risk of loss.