3 x 1 x 1/4" 7.6 x 2.5 x .6cm
Walthers Part # 949-522, p. 844 Walthers 2021 HO Scale Reference
A scale,
 

A Fine-Grit Abrasive Block for Track & Electrical Contacts

If you're looking for a mildly abrasive cleaning block for track and electrical contacts that minimizes scarring of your metal surfaces, this is it. This soft abrasive Bright Boy cleaner is ideal for polishing rail, wheels and other electrical contacts.