- Conical Inserts with Polymer Feet,100/pk. Be the first to review this product. $124.00. SKU: . Overview. Specifications. Vial insert, 250 µL, glass with polymer feet, 100/pk Insert size: 5.6 x 30 mm. Vial insert, 250 µL, glass with polymer feet, 100/pk Insert size: 5.6 x 30 mm. Products specifications.