Shakti Springs Inc. Manufactures Internal and External Circlips. Shakti Springs Inc. Is an ISO 9001 certified company. The Internal and External Circlips are made as per DIN: 471 & 472 Internal / External type. The Internal and External Circlips comes with a diameter ranging from 10mm to 50mm and a thickness range of 1.0mm to 1.5mm. The circlips are subjected to phosphating for surface treatment. The various types of circlips manufactured are flat wire circlips, circlips to DIN 472 and round wire circlips.