Small porcelain wire connector. For high temperature applications. Rated for AC/DC use up to 300 volts. Withstand temperatures in excess of 1000 degrees. 2, 3 or 4 No. 18. 2 or 3 No. 16. 1 or 2 No. 18 with 1 No. 16. 3 No. 18 with 1 No. 16. 1 No. 18 with 1 No. 14.