Spartacus Leathers A Passion for Quality Plain Collar 1 inch with Buckle and D-ring. Why do you wear your collar? For fun, for fashion, for her, for him. Your reason may vary, but our quality stays the same. Experience comfort, style and durability in Spartacus leather collars. This plain 1 inch wide unlined with D-ring collar adjust 12 inches to 17 inches.