Panther Fixed• 2 separate locks (Slam lock and deadlock combination)• Stainless steel rivets arranged in strategic places for maximum strength.• 3mm thick cross flights, linked in place using VIROs’ unique POWER PIN SYSTEM (patented)• 4 rows of 3mm cross fights spanning over 3 uprights, for structural strength. (Registered Design – unique to VIRO)• VIROs’ unique, “lipped channel” double galvanized uprights. Designed for strength and to combat corrosion. (patented)Panther Retractable• 2 separate locks (Slam lock and deadlock combination)• Tamper resistant installation (unique feature) Stainless steel rivets arranged in strategic places for maximum strength.• 4 rows of 5mm cross fights spanning over 3 uprights, for structural strength. (Registered Design – unique to VIRO)• VIROs’ unique, “lipped channel” double galvanised uprights. Designed for strength and to combat corrosion. (Patented)• Bolt cutter resistant, 5mm thick cross flights, linked in place using VIROs’ unique POWER PIN SYSTEM (patented), making it the strongest option.