スナップオンのロングピンポンチセットになります5/32" PPC105LA7/32" PPC107LA1/4" PPC108LA5/16" PPC110LAThe anvil end on heads of Snap-on punches are machined to a modified parabolic curveThis design directs the striking force to the center of the tool to allow slow metal displacementThe parabolic curve controls mushrooming to reduce chipping and splittingHeads should be redressed to their original shape with hand files as necessaryThe tough alloy steel is machined and differentially heat-treated for optimum performanceThe hardness of the striking head is reduced to help toughness and add qualities that result in a slower mushrooming of the striking surfaceということで、ヘッドのマッシュルーム化を防いでいます
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