DIAO79NI USA Thread Humbucker Height Adjustment Screws + Springs are precision-engineered for electric guitar pickup mounting. Compatible with Gibson, Seymour Duncan, EMG, Dimarzio, Artec (Korea), and most USA-standard humbuckers. Features UNC #3-48 threads (2.5mm/0.098" diameter) with pan head (4.2mm/0.165" head diameter) and Phillips drive. Available in 2 lengths (27mm/1.06" or 31mm/1.22") and 3 colors (Black, Chrome, Gold). Made of stainless steel for durability, corrosion resistance, and enhanced sustain. Includes 4 screws + 4 springs per pack. Thicker steel springs reduce vibration and stabilize pickups. Check sizing chart and compare with your existing screws before purchase.