The screw caps are used to lock the bar to the screw. Locking this cap (or nut) is actually what locks the polyaxial head in place making it one ridged contruct.
This cap is for the 3.0mm rod system and uses the 3.0mm torque limiting device to oppose motion at the interface between the tulip and the rod
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Returns
All stainless steel goods returned in their original packaging will be eligible for a full credit. A 20% re-packing charge will be applied to goods not returned in their original packaging.
Some specialist products like OrthoFoam™ wedges and RidgeStop™ implants are not sold on a sale or return basis