The VPHV-4-F VALUMAX® 4 inch Post Holder with Clamping Fork Bundle features a unique collet locking mechanism allowing the orientation of an optical mount to be easily adjusted with one hand. The pedestal base offers the flexibility of securing components anywhere on an optical table when using a PS-F Slotted Clamping Fork. VALUMAX® Series Post Holders are precision molded from a composite material with thermal and electrical insulating properties as well as an exceptional degree of thermal stability, dimensional stability, and chemical resistance. VALUMAX posts and post holders are ideal for cost sensitive or non-critical mounting applications.