315mm Keychain Clasp: about 15×2.4mm, inner diameter: 12.6mm,

 

20mm Keychain Clasp: about 20×2.4mm, inner diameter: 17.6mm,

 

25mm Keychain Clasp: about 25×2.9mm, inner diameter: 22.1mm

 

30mm Keychain Clasp: about 30×3.6mm, inner diameter: 26.4mm, 20pcs

 

Iron Jump Rings: about 21 gauge, 8×0.7mm; inner diameter: 6.6mm

 

Iron Screw Eye Pin Peg Bails: about 10x5x1mm, hole: 2mm