Makita 18G Narrow Crown Stapler Model Number: AT638 In-use data available 1/4" (6.35mm) narrow crown stapler with durable and lightweight die cast housing. Compare View Product Makita 18G Stapler And Air Kit Model Number: AT638X 1/4" (6.35mm) narrow crown stapler with durable and lightweight die cast housing. Included in kit: AT638, AC640 Compressor, 5000x18mm staples, 5000x25mm staples, 15m hose. Compare View Product