Description The Induro PU-50 Slide-In Quick Release Plate has a 1/4"-20 thread and is a spare or replacement part for B-00 and B-0 Ballheads and other Arca-Swiss compatible Quick Release clamps. Inbox Induro PU-50 Slide-In Quick Release Plate for B-00 & B-0 Ballheads Limited 10-Year Manufacturer Warranty