Universal ( dont know original Manufacturer)  counterbalance weight without resettable graduations to suit tonearms designed for weight with an internal  spiral groove..

Narrowest Aperture is approx 11mm,  Rear aperture approx 14mm 

Weight is 143 grams 

Diameter 33 mm  ( 1.299 inch)

Overall length 29.00 mm  ( 1.14 Inches)