SPDC-M4-20-H NBK Plastic Screw - Hex Head Screws - VESPEL（Grade:SCP-5000 ) Pack of 1 Screw - Made in JapanSPDC M4 20 H NBK Plastic Screw Hex Head Screws VESPEL ( Grade: SCP 5000 ) Pack of 1 Screw NBK Made in Japan Characteristics: VESPEL SP 1 is a non thermoplastic super engineering plastic with excellent physical and chemical properties. Properties of VESPEL SP 1 It does not reach a softening point, such as its melting point or glass transition point, even under high temperatures and can be used continually at 288 deg C. The screws have excellent