- Precision Sheet Metal Fabrication and Metal Stamping 18437 171st Avenue Spring Lake, MI 49456 Phone: (616) 842-6960 Fax: (616) 842-0965 1-800-394-8276 Sintel, Inc. is a full-service design, engineering and sheet metal fabrication company. Our products are standard and special precision sheet metal fabricated parts and metal stampings. The products are augmented by the Sintel brand of service ...sintelinc.com