... free terminal locking component and fixed terminal locking component according to application.J30J free terminal locking component:Used for free terminal products, it ... K, K1 and so on.J30J fixed terminal locking component:Used for fixed terminal products, it has types of P, P0, ... : type of locking components: free terminal locking component-type L, K, K1; fixed terminal locking components-type P, P0, ...