Plate, spring mount, 4-1/4" x 3-1/4" x 3/8" thick. 4 holes, 3/8" dia, on 3-3/8" x 2-1/4" centers. The center hole is 7/16" dia. Designed as a suicide spring mount for 1-3/4" wide springs. This plate works well with 2 gussets 21272 (sold separately). 21271