Based on this product's specifications, here are some alternatives and similar models
Rittal AS 4051.548 insulated ferrules 0.5 mm² (AWG 20) copper core, polypropylene collar, length 8 mm, pack of 4000
Summary description:
Rittal AS 4051.548 are insulated ferrules for terminating 0.5 mm² (AWG 20) conductors. Each ferrule features a copper crimp barrel and a polypropylene (PP) insulating collar, with an 8 mm length. Supplied in a pack of 4000, these ferrules provide reliable, gas-tight wire connections for control panels, terminal blocks and general electrical installations.