Fowler X-Blox V-Block Set Use this universal holding tool for small, miniature or intricate parts. Ideal for holding, grinding/indexing punches and pins, drilling, milling, EDM, inspection on optical comparators. Set includes... 2 Small X-Bloxs Dimensions: 1-1/2" L x 1-1/4" W x 1-1/4" H. Work capacity: Approximately 1" 2 Large X-Bloxs Dimensions: 2" L x 1-1/2" W x 1-1/2" H. Work capacity: 1-1/2" Features include... Surfaces are square and parallel within .0005" V-grooves are square and parallel with all surfaces within .0005" Corresponding dimensions for each pair are alike within .0005" All enclosed in shop-hardened case