Prindle Loop Top Single Block 

Murrays Part# 21-0571

Used on older Prindle trapeze return shock cord, this single, loop head block has lightweight, durable construction and is suitable for use with up to 1/4" line. Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.