Rotational mold inserts are used in rotational molding to provide anchor points for other hardware such as handles and hinges. Roto mold Inserts come in a variety of shapes including multi-collared, one-headed, square and hex. Threading covers a broad range of imperial and metric sizes as well as Pipe and SAE threads. This insert is designed to combine maximum strength with uniform heat gain, used by moulders on difficult applications where knurled inserts just aren't enough.