Feature●Guaranteed square parallel & central within 0.0002; Hardened & ground to RC 58-60●90 Vee Blocks; One reversible swing away clamp supplied with each V-Block Side slots for easy clamping●Length: 4-1/8; Width: 4-1/8; Height: 3-1/16●5/16 - 2-7/8 capacity●Diameter Capacity: Min.: 9/32" / Max.: 2-9/16"Description