The 30mm Plain Bearing Through Deck Single is a vital component for rope control lines to navigate through a deck or surface. With a durable acetal body and perfectly shaped sheave, this block ensures reliable performance for adjustable rigging and other high-load applications. Choose from either single or double sheaves, as well as plain or ball bearing systems, to best suit your specific needs. The use of an acetal sheave spinning around a central axle results in a long lifespan and low maintenance for the Plain Bearing option.