You are looking at one brand new 3/4" (1.9 cm)  strap buckle. This item 1813-13 is made of all metal and plated in black. The 5/8" measurements means that it fits a belt or strap that 5/8" wide. Please feel free to email with any questions. Thank you for looking.

Size:

Strap Size         3/4" (1.9 cm) 

Outside Length  1-1/4" (3.17 cm)

Outside Width   1-1/4' (3.17 cm)