Our Spikes all Pins are Pre-Assemble,they are weld in the base plastic stake very Stable and Durable.Surely this will save your time and prevent scratch your hand. You just fix the spike stakes to the place you want. PERFECT FLEXIBILITY: Easy to install, even can be installed on round surfaces. Lightweight, Clear and Low-profile. NO MAINTENANCE REQUIRED: Heavy duty stainless steel prongs plus durable polycarbonate base offer the perfect combination of flexibility and effectiveness without maintenance needed. REPEL PEST BIRDS: Seagulls, crows, pigeons, starlings, sparrows and more. Also useful for deterring cats and squirrels. VERSATILE: Great for balconies, roofs, barn rafters, commercial signs, patios, parking lots and more. Each Spike long 48.5cm; Includes 5/8/10 stakes per pack(Total 5/8/10*48.5cm)