Novoflex Q System Focusing Rack with Quick Release Base (CASTEL-Q) Q System Focusing Rack with Arca-Style Quick Release Adapter (requires QR Plate) Focusing rack Q system (ARCA compatible) Precision Made 4.9 inch travel range Dimensions: 7.9x3.9x1.3 inches Glider width: 2.6 inches Weight: 1 lb