Socket Cap Screws, also known as Allen Bolts. Manufactured to DIN 912\/ ISO 4762 in Self Colour High Tensile 12.9 Steel.\r\nPlease note that these are sold in multiples of 5.\r\nSocket Cap Screws are perfect for applications where space is limited or where the screw head is installed in a recess due to the use of an allen key to tighten them. Ideal for use where there is not enough clearance to use a Hex Head Bolt. Suitable for applications where high strength is required due to the high tensile strength. These screws are partially threaded as standard after a certain length.\r\nPlease note that these bolts offer little to no protection from rusting and are more suited for indoor use or for applications where they are protected from moisture.