SPIROL has introduced a new series of molded-in inserts for plastic assemblies. The rugged design of the Series 63 through-hole inserts and Series 65 blind-end inserts consists of multiple bands of helical knurls to maximize torque resistance, balanced with radial undercuts to achieve high pull-out force. These inserts are designed to be placed in the mold cavity prior to plastic injection, and offer exceptional performance due to unrestricted plastic flow into the retention features on the outside diameter of the inserts.