... with 5 years expreience in exporting business our hoops (clamps) meet customers' standard Product: hoops--spring hose clampISO9001:2000 certificatewith 5years experience ... spring washer, E-ring (retaining ring), circlips, wooduff key and hoops meets Germany standard especially DIN471, DIN472, DIN983, DIN 988, DIN984 ...