These are 1/4" Nickel Plated Brass Dura-Collars Shaft Savers

FEATURES: Nickel plated brass construction

INCLUDES: Two collars Two 8-32x1/8" set screws

REQUIRES: Installation. 5/64" allen wrench

SPECS: Length: .250" Diameter: 1/4" ID .487 OD tjt 040902 ir/kh  

BOX DIMENSIONS: 2.25" W. X .25" H. X 2.25" L. BOX WEIGHT: .02 LBS.