Carbine snap hook with locking nut made from marine grade A4 316 stainless steel
Safe working loads are normally five times less the breaking loads

4mm x 40mm 
A : Hook thickness - 4mm
B : Hook overall length - 40mm
C : Bottom circle Diameter - 6mm
Opening gap - 4.5mm
Breaking load 1.2kn
Marine grade
A4 316 Stainless Steel Polished

5mm x 50mm 
A : Hook thickness - 5mm
B : Hook overall length - 50mm
C : Bottom circle Diameter - 8mm
Opening gap - 5.5mm
Breaking load 2.2kn
Marine grade
A4 316 Stainless Steel Polished

6 x 60mm Spec
A : Hook thickness - 6mm
B : Hook overall length - 60mm
C : Bottom circle Diameter - 9mm
Opening gap - 6.5mm
Breaking load 3.1kn
Marine grade
A4 316 Stainless Steel Polished

7 x 70mm Spec
A : Hook thickness - 7mm
B : Hook overall length - 70mm
C : Bottom circle Diameter - 10.5mm
Opening gap - 7.5mm
Breaking load 4.3kn
Marine grade
A4 316 Stainless Steel Polished

8 x 80mm Spec
A : Hook thickness - 8mm
B : Hook overall length - 80mm
C : Bottom circle Diameter - 12mm
Opening gap - 8.5mm
Breaking load 5.5kn
Marine grade
A4 316 Stainless Steel Polished

10 x 100mm Spec
A : Hook thickness - 10mm
B : Hook overall length - 100mm
C : Bottom circle Diameter - 15mm
Opening gap - 11mm
Breaking load 7.5kn
Marine grade
A4 316 Stainless Steel Polished

Carabiner stainless steel marine grade karabiner carbine hook snap spring lock nut eyelet