Rutgerson ROC Block Insert – Under-bow or line guide for ROC blocks

More flexibility in your rigging: With the Rutgerson ROC Block insert, you can transform your ROC block into a thimble or an additional line guide in an instant. The two-part composite insert can be screwed directly into the block with minimal tools.

Tip: Choose the insert to match your existing ROC block – ROC80 insert for lines up to 14 mm, ROC100 insert for lines up to 16 mm. The self-tapping screws grip directly into the block, no pre-drilling required.