On-Stage MSA9508 Posi-Lok Sidemount Microphone Boom Ideal for microphone applications where space is limited and the position needs to be fixed Posi-Lok adds versatility to standard 5/8" -27 mic applications Round ergonomic knob for quick and easy angle adjustments The adjustable side mount boom grips to any round shaft with a nylon tipped tightening screw that won't damage the shaft