1" Coupler is available in 24" adjustable. (Dogs) - $10.45 5/8" Coupler is available in 24" adjustable. (Dogs) - $9.57 1/2" Coupler is available in 18" adjustable. (Puppies & Ferrets) - $9.08 3/8" Coupler is available in 18" adjustable. (Puppies & Ferrets) - $9.08