Lappkabel skintop gmp gl series locknuts silver grey black light grey lappkabel 53019050 this lappkabel skintopreg locknut is used for locking a cable gland in a borehole without a thread the hexagonal locknut is equipped with a special collar which stops the spanner from slipping and also prevents scratches on the housing the glass fibre reinforced construction gives maximum mechanical stability lappkabel 53019050 skintop gmp gl pg21 locknut grey