When competing in rigorous sailing races and constantly executing hoists and douses on W-L legs, you might think side angle wear on your halyard exit block is inevitable. Think again With Harken Protexit blocks, you'll experience minimal wear thanks to its all-aluminum, wear-resistant housing that efficiently guides line in and out at any angle. Moreover, Harken thru deck blocks boast higher working loads than any small boat exit blocks previously produced. The aluminum sheaves in Protexit blocks turn on sleeve bearings, featuring Delrin sideload balls, which ensure durability under extreme conditions and also reduce halyard wear. Delrin is a trademark of E. I. du Pont de Nemours and Company or its affiliates.