STEER Engineering [P] Ltd manufactures Tri-lobed Kneading Block with Bi-lobe Ends. STEER Engineering [P] Ltd is an ISO 9001 certified company. Tri-lobed Kneading Block with Bi-lobe Ends is available in five segments. It can be used in a bi-lobed extruder. The increase in number of lobes facilitates dispersive mixing or melting. These blocks can be used in any type of extruder including the older generation machines with key-ways or straight sided splines.